Interface Shear Instructions: ASTM D OR. ASTM D 1. Test Type. Isolated Interface. Multiple Interfaces (“floating”) – skip to “3” below. 2. Shear Plane. ASTM D/DM: Standard Test Method for Determining the Shear Strength of Soil-Geosynthetic and Geosynthetic-Geosynthetic Interfaces by Direct . ASTM D/DM Standard Test Method for Determining the Shear Strength of Soil-Geosynthetic and Geosynthetic-Geosynthetic.

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Results obtained from this method may be limited in their applicability to the specific conditions considered in the testing. Care should be taken, including close visual inspection of the d55321 after testing, to ensure that the testing conditions are representative of those being investigated. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

The test specimens and conditions, including normal stresses, are generally selected by the user. A shear force is applied to the apparatus such that one section of the box is moved in relation to the other.

ASTM D Archives | Geosynthetica: Geosynthetics Engineering

For more information, contact: The normal loads used typically at least three normally represent design conditions. The total shear resistance may be a combination of sliding, rolling, and interlocking of material components. Geosynthetic testing Back to Results Print. Request Quote Client Login. The shear force is recorded with respect to displacement. In cases of dispute, comparative tests to determine whether a statistical bias exists among laboratories may be advisable.


Testing under this test method should be performed by laboratories qualified in the direct shear testing of soils and meeting the requirements of Practice Despecially since the test results may depend on site-specific and test conditions.

Link to Active This link will always route to the current Active version of the standard.

For Individuals with needing special assistance for disabilities or limited English proficiency Please contact our Title VI specialist at ashm The peak and post-peak shear stresses are plotted against the applied normal stresses. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.

The method of test data interpretation for purposes of acceptance should be mutually agreed to by the users of this test method. Shear resistance between a geosynthetic and a soil, or a geosynthetic and another geosynthetic is measured.

The determined value may be a function of the applied normal stress, material characteristics for example, of the geosyntheticsoil properties, size of sample, moisture content, drainage conditions, displacement rate, magnitude of displacement, and other parameters.


Historical Version s – view previous versions of standard. In the case of acceptance testing requiring the use of soil, the user must furnish the soil sample, soil parameters, and direct shear test parameters.


The test data are presented by a best fit straight line whose slope is the coefficient of friction between the two materials where the shearing occurred. The y-intercept of the straight line is the adhesion.

Geosynthetic testing Lab Services: The geosynthetic and other material is placed within v5321 large-scale direct shear box with an applied normal load on top.

The user of results from this test method is cautioned that results at a specified displacement may not be reproducible across laboratories and that the relative shear displacement measured in this test at peak strength may not match relative shear displacement at peak strength in a field condition.

Every effort should be made to identify, as closely as practicable, the sheared area and failure mode of the specimen. Combining values from the two systems may result in nonconformance with the standard.

Referenced Documents purchase separately The documents listed below are referenced ast, the subject standard but are not provided as part of the standard.